Architectural building slab



FIG. 1 is a perspective view of the architectural building slab of my new design.

FIG. 2 is an top plan view thereof.

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is an elevational view of one side thereof. The elevational views of the other three sides are identical. 

CLAIM The ornamental design for an architectural building slab, as shown and described. 